Home / 7,115.28-9,819.67-3,928.87

Finding the Fourth Proportional to 7,115.28, 9,819.67 and 3,928.87

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Solution

The fourth proportional to 7,115.28, 9,819.67 and 3,928.87 is: 5,422.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.28 : 9,819.67 = 3,928.87 : x
  2. Step 2: Convert to fraction form
    7,115.28/9,819.67 = 3,928.87/x
  3. Step 3: Cross multiply
    7,115.28x = 9,819.67 × 3,928.87
  4. Step 4: Simplify right side
    7,115.28x = 38,580,206.87
  5. Step 5: Solve for x
    x = 38,580,206.87/7,115.28
  6. Step 6: Final answer
    x = 5,422.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.